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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Mixture A is 15 percent alcohol, and mixture B is 50 percent ##### This topic has 1 expert reply and 0 member replies ### Top Member ## Mixture A is 15 percent alcohol, and mixture B is 50 percent ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult Mixture A is 15 percent alcohol, and mixture B is 50 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 30 percent alcohol, approximately how many gallons of mixture A are in the mixture? A. 1.5 B. 1.7 C. 2.3 D. 2.5 E. 3.0 OA C Source: Princeton Review ### GMAT/MBA Expert GMAT Instructor Joined 25 May 2010 Posted: 15344 messages Followed by: 1864 members Upvotes: 13060 GMAT Score: 790 Top Reply BTGmoderatorDC wrote: Mixture A is 15 percent alcohol, and mixture B is 50 percent alcohol. If the two are poured together to create a 4-gallon mixture that contains 30 percent alcohol, approximately how many gallons of mixture A are in the mixture? A. 1.5 B. 1.7 C. 2.3 D. 2.5 E. 3.0 A = 15% alcohol B = 50% alcohol The MIXTURE of A and B = 30% alcohol To determine the ratio of A to B, use ALLIGATION -- a very efficient way to handle mixture problems. Step 1: Plot the 3 percentages on a number line, with the percentages for A and B (15% and 50%) on the ends and the percentage for the mixture (30%) in the middle. A 15-----------30------------50 B Step 2: Calculate the distances between the percentages. A 15----15----30----20----50 B Step 3: Determine the ratio in the mixture. The ratio of A to B is equal to the RECIPROCAL of the distances in red. A:B = 20:15 = 4:3. Of every 7 pounds, 4 pounds = A and 3 pounds = B, implying that A constitutes 4/7 of the 4 gallons: (4/7)(4) = 16/7 â‰ˆ 2.3 The correct answer is C. Other alligation problems: http://www.beatthegmat.com/mixture-problem-rabbit-proteins-t190121.html#593241 _________________ Mitch Hunt Private Tutor for the GMAT and GRE GMATGuruNY@gmail.com If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon. Available for tutoring in NYC and long-distance. For more information, please email me at GMATGuruNY@gmail.com. Student Review #1 Student Review #2 Student Review #3 Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now. • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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